<template>
  <div class="cart-box">
    <s-header name="购物车" noback="true" />
    <div class="cart-body">
      <van-checkbox-group @change="groupChange" v-model="result" ref="checkboxGroup">
        <vant-swipe-cell :right-width="50" v-for="(item, index) in list" :key="index">
          <div class="good-item">
            <van-checkbox :name="item.cartItemId" />
            <div class="good-img"><img :src="$filters.prefix(item.goodsCoverImg)" alt=""></div>
            <div class="good-desc">
              <div class="good-title">
                <span>{{item.goodsName}}</span>
                <span>{{item.goodsCount}}</span>
              </div>
              <div class="good-btn">
                <div class="price">¥{{ item.sellingPrice }}</div>
                <van-stepper integer :min="1" :max="5" :model-value="item.goodsCount" :name="item.cartItemId" async-change @change="onChange" />
              </div>
            </div>
          </div>
          <template #right>
            <van-button square icon="delete" type="danger" class="delete-button" @click="deleteGood(item.cartItemId)" />
          </template>
        </vant-swipe-cell>
      </van-checkbox-group>
    </div>
    <van-submit-bar 
      v-if="list.length > 0"
      class="submit-all van-hairline--top"
      :price="total * 100"
      button-text="结算"
      @submit="onSubmit">
      <van-checkbox @click="allCheck" v-model:checked="checkAll">全选</van-checkbox>
    </van-submit-bar>
    <div class="empty" v-else>
      <img class="empty-cart" src="https://s.yezgea02.com/1604028375097/empty-car.png" alt="空购物车">
      <div class="title">购物车空空如也</div>
      <van-button round color="#1baeae" type="primary" @click="goTo" block>前往选购</van-button>
    </div>
    <nav-bar/>
  </div>
</template>

<script>
import sHeader from '@/components/SimpleHeader'
import navBar from '@/components/NavBar'
import { reactive,toRefs,onMounted, computed } from 'vue'
import { Toast } from 'vant'
import { useRouter } from 'vue-router'
import { useStore } from 'vuex'
import { getCart,modifyCart,deleteCartItem } from '@/service/cart'
export default {
  components:{
    sHeader,
    navBar
  },
  setup(){
    const state = reactive({
      list: [],
      result: [],
      checkAll:true
    })
    const router = useRouter();
    const store = useStore();
    const groupChange = (result) =>{
      state.checkAll = result.length === state.list.length ? true : false ;
      state.result = result
    }
    onMounted(()=>{
      init();
    })
    const init = async() =>{
      Toast.loading({ message: '加载中...', forbidClick: true });
      const {data} = await getCart({pageNumber:1});
      state.list = data;
      state.result = data.map(item => item.cartItemId)
      Toast.clear();
    }
    const goTo =() =>{
      router.push({ path: '/home' })
    }
    const total = computed(()=>{
      let sum = 0;
      let _list = state.list.filter(item => state.result.includes(item.cartItemId));
      _list.forEach(item => {
        sum += item.goodsCount * item.sellingPrice
      })
      return sum;
    })
    const onChange = async(value,detail) =>{
      if (value > 5) {
        Toast.fail('超出单个商品的最大购买数量')
        return
      }
      if (value < 1) {
        Toast.fail('商品不得小于0')
        return
      }
      if (state.list.filter(item => item.cartItemId == detail.name)[0].goodsCount == value) return
      Toast.loading({ message: '修改中...', forbidClick: true });
      await modifyCart({cartItemId: detail.name,goodsCount: value})
      state.list.forEach(item =>{
        if(item.cartItemId === detail.name){
          item.goodsCount = value
        }
      })
      Toast.clear();
    }
    const allCheck = () =>{
      state.result = !state.checkAll ? state.list.map(item => item.cartItemId) : [];
    }
    const onSubmit = () =>{
      if (state.result.length == 0) {
        Toast.fail('请选择商品进行结算')
        return
      }
      const params = JSON.stringify(state.result)
       router.push({ path: '/create-order', query: { cartItemIds: params } })
    }
    const deleteGood = async(id) =>{
      await deleteCartItem(id);
      store.dispatch('updateCart')
      init()
    }
    return {
      ...toRefs(state),
      total,
      groupChange,
      onChange,
      goTo,
      deleteGood,
      allCheck,
      onSubmit
    }
  }
}
</script>

<style lang="scss" scoped>
@import '@/common/style/mixin';
.cart-box {
    .cart-header {
      position: fixed;
      top: 0;
      left: 0;
      z-index: 10000;
      @include fj();
      @include wh(100%, 44px);
      line-height: 44px;
      padding: 0 10px;
      @include boxSizing();
      color: #252525;
      background: #fff;
      border-bottom: 1px solid #dcdcdc;
      .cart-name {
        font-size: 14px;
      }
    }
    .cart-body {
      margin: 16px 0 100px 0;
      padding-left: 10px;
      .good-item {
        display: flex;
        .good-img {
          img {
            @include wh(100px, 100px)
          }
        }
        .good-desc {
          display: flex;
          flex-direction: column;
          justify-content: space-between;
          flex: 1;
          padding: 20px;
          .good-title {
            display: flex;
            justify-content: space-between;
          }
          .good-btn {
            display: flex;
            justify-content: space-between;
            .price {
              font-size: 16px;
              color: red;
              line-height: 28px;
            }
            .van-icon-delete {
              font-size: 20px;
              margin-top: 4px;
            }
          }
        }
      }
      .delete-button {
        width: 50px;
        height: 100%;
      }
    }
    .empty {
      width: 50%;
      margin: 0 auto;
      text-align: center;
      margin-top: 200px;
      .empty-cart {
        width: 150px;
        margin-bottom: 20px;
      }
      .van-icon-smile-o {
        font-size: 50px;
      }
      .title {
        font-size: 16px;
        margin-bottom: 20px;
      }
    }
    .submit-all {
      margin-bottom: 50px;
      .van-checkbox {
        margin-left: 10px
      }
      .van-submit-bar__text {
        margin-right: 10px
      }
      .van-submit-bar__button {
        background: $primary;
      }
    }
    .van-checkbox__icon--checked .van-icon {
      background-color: $primary;
      border-color: $primary;
    }
}
</style>